Year	Number of
1990	348.58
1991	342.49
1992	353.43
1993	366.84
1994	368.77
1995	375.19
1996	388.68
1997	400.43
1998	420.14
1999	433.95
2000	441.4
2001	450.38
2002	461.65
2003	482.76
2004	489.27
2005	491.56
2006	493.61
2007	506.76
2008	524.61
2009	538.06
2010	557.24
2011	566.15
2012	573.17
2013	581.23
2014	594.06
2015	610.02
2016	623.56